EP2485974A1

EP2485974A1 - Device for cutting paper webs

Info

Publication number: EP2485974A1
Application number: EP09783775A
Authority: EP
Inventors: René KRÖHNERT; Wolfgang Freyer; Beat Kipfer
Original assignee: Kern AG
Current assignee: Kern AG
Priority date: 2009-10-06
Filing date: 2009-10-06
Publication date: 2012-08-15
Anticipated expiration: 2029-10-06
Also published as: JP5574305B2; CN102639418A; CN102639418B; WO2011042047A1; BR112012007941A2; US20120222528A1; EP2485974B1; JP2013506612A; US10106356B2

Abstract

The invention relates to a device for cutting paper webs, comprising a substantially continuously operated area for feeding paper and a discontinuous area for transversely separating the paper web. A buffer area (15) is provided for coupling the continuous and discontinuous areas, wherein at least one box-like container (17) open at the top is provided, into which the paper web(s) (3, 3') are guided so as to be looped in a freely suspended manner. The buffer area is arranged after a longitudinal cutting apparatus (9) for producing at least two longitudinal webs (3,3'), whereby at least two webs extending separately and adjacently to one another are guided in the container or at least two containers are arranged adjacently to one another or adjacently to one another at an offset, wherein the paper webs are guided into said containers.

Description

Device for cutting paper webs

The present invention relates generally to a

Device for cutting paper webs, such as

in particular a longitudinal and transverse separating device and in particular a device in the buffer area in front of the

Cross-cutting device, where the paper web or the

Paper webs are longitudinally cut and prepared for a cyclic feed and a trigger assembly for the controlled withdrawal of the cut paper in the region of the cross-cutting device.

Cutting devices have been known for some time. They are mainly used for cropping printed matter

Used paper webs, such as those of larger companies in the service sector, such as financial or

Insurance sector and administrations. It refers to

High performance paper processing equipment, which i.a.

Include power cutting devices and are designed to operate as automated as possible.

To ensure safe operation at such high flow rates and speeds, various precautions must be taken. For example, the quiet and safe guidance of the paper web is of central importance. Another problem arises with the

Paper feeder for the cutting device: For a safe and for all purposes qualitatively sufficient

To make paper cross-separation, which in particular should have no crack marks, the paper web before and be stopped for a short moment at the cross-separation. It follows that the paper web at the place of

Cross-cutting device is moved at different speeds, or different phases of movement

passes. In addition to a phase of constant

Speed, which can be as short as possible in practical operation, will also become phases of

Acceleration and a deceleration phase needed to stop. This results in an average speed which ^corresponds to the speed of the

Paper feed corresponds and the operating speed of the permanently operating device makes.

Because these high-performance cutters should work as continuously as possible and without interruption, measures must be taken according to which the paper web in a certain area of the processing line or the

Cutting device is dammed (brake or

Holding phase) in order to break down the accumulated material after the transverse separation has occurred during an acceleration phase and return it to the normal movement (constant

Speed). It must be ensured that, in particular, the type of acceleration does not lead to tearing of the paper web.

From DE 100 11 006 is a device for cutting paper webs operated by a blower

Paper delay device known in which the

Paper web by means of acting from the underside of the web air flow through an upward

Loop is guided. The path delay described in EP 1 268 329 or WO 01/66448 is also based on this principle which has just been described, in a device for cutting paper webs.

Furthermore, EP 1 741 653 describes that first the

Paper web is cut longitudinally and then the two separate webs are fed via a respective large, loosely hanging loop of the cross-cutting device. In this device is due to the relatively large

Loop the danger of uncontrolled paper guidance and thus of tilting and crumpling.

Equally important in this context is that in the subsequent cross-cutting device, the paper webs are stopped only very briefly for the cutting process, that is, the cross-cutting process must be carried out as quickly as possible so that it does not come to unnecessary and oversized paper jam in the supply.

It is thus a first object of the invention to provide a

To offer device in which the coupling of the

at least approximately continuous operation

Paper feed with the discontinuous operation in the cross-cutting device is such that no

Slipping, crumpling or even tearing of the paper web takes place. It is also important that by the longitudinal separation of the paper web and thus the merging of the two partial webs, the resulting different feed of the

Partial railways is compensated.

Another object of the present invention is to break the discontinuities in the discontinuous part In the case of the cross-separation means to keep as short as possible and thus to accelerate the withdrawal of the cut paper.

According to the present invention is accordingly a device for cutting paper webs with a largely continuously operated range of

Paper feed and a discontinuous area of the transverse separation of the paper web according to the wording

Claim 1, proposed.

It is proposed that, if necessary, after the

Slitting between continuous and

Batch area provided for discontinuous area, for coupling the continuous and discontinuous area, at least one open-topped, box-like container, in which the paper web or the paper webs are guided hanging looped.

In the container, a negative pressure can be generated, such that the paper web is driven or pulled into the container and optionally against the side walls.

But it is also possible that in the region of the opening a fan is provided to drive the paper web in the container.

The buffer area is arranged according to a variant according to a longitudinal cutting device, in which at least two longitudinal tracks are generated, which in the

Container are performed at least two separate and juxtaposed webs, or the two webs are guided in two juxtaposed containers. By placing the buffer area after a longitudinal separator, the problem is taken into account, that two partial webs by means of possibly

different feed to the cross cutting device are performed. Thus, better buffering between

continuous and discontinuous operation of the separated moving webs guaranteed.

Again, according to a further embodiment, it is proposed to centrally between the loops of

Paper webs to provide a separator, such as a divider, to center a collar of the loops to

prevent.

If the container or containers have a U-shaped cross-section, for example, suction openings or a suction fan in the bottom of the container for generating a negative pressure may be arranged to pull the paper webs down. But it is also possible, further in the side walls of the container suction elements

provided to pull the paper webs against the side walls.

In the event that, for example, three or more

Longitudinal webs are generated, according to the paper webs thus produced can be looped into a container, pulled, or it can be arranged next to each other or offset side by side according to three or more containers to pull the respective paper webs for the compensation in the container.

According to a further embodiment variant of the present invention, it is proposed, following on from the buffer zone or the containers mentioned above, a so-called

Provide braking zone by, for example, along a negative pressure is generated below the paper webs leaving the container or containers in order to prevent uncontrolled paper movement. Since the paper webs leaving the buffer zone are briefly stopped and accelerated again in the region of the transverse cutting, there is a risk of so-called overshoot on exiting the paper webs from the vacuum box described above, which can lead to bulging or tearing of the paper webs. For this reason, it is proposed according to the invention to provide, for example each subsequent to the so-called vacuum box in the swept through the paper webs surface suction holes, by means of which below the paper web, a negative pressure can be generated. The generated negative pressure is control-coupled with the transverse cutting process or the transport rollers upstream of the transverse cutting process, so that a braking effect is generated when the transport or during the paper delay, by means of the negative pressure. In the

Paper acceleration, the negative pressure is removed, so that the braking effect is eliminated and can be accelerated with little force and low rail load.

In the area of the cross-cutting device, a further measure according to the invention is proposed, in order to optimally guide one or the other or both paper webs into the region of the transverse separation, to increase the cutting accuracy and to remove the cut papers from the

Cutting area as quickly as possible and remove any traces of abrasion. It is suggested that one of the

Cross separation device downstream transport device is controllable such that they at least temporarily can be deactivated when feeding the paper web by one of the cross-cutting device upstream

Transport device is deactivated, so that the paper web is inserted without resistance in the region of the transverse separation. At or shortly after or just before

Cross cutting process will be this subsequent

Transport device activated to transport away the cut paper. It may, for example, be two rollers or rollers engaged for transport, one roller or roller being movable away from the other during insertion of the paper web and driven against the other roller or roller at or shortly before or shortly before transverse separation ,

Preferably, the transverse separation takes place by means of a

Cutting element which has two cutting edges, such that with each movement of the cutting element, that is, upwards or downwards, a transverse separation of the

Paper web can be effected. Reference is made to WO 2004/018167, in which such a cross-cutting device is described, which in combination with the

proposed measures according to the invention is also part of the present invention.

Finally, it is proposed in the area between

Buffer area and cross-separation to provide an assembly, comprising inclined sliding tubes to the at least two parallel, in advance

longitudinally separated paper webs to arrange one above the other. The sliding tubes are preferably equipped with blown air to smear or stick together the Paper webs to prevent further preferred embodiments of the inventive device are characterized in dependent claims.

Further proposed is a method for cutting paper webs according to the wording of claim 11. Further variants of the inventive method are characterized in further dependent claims.

The invention will now be explained in more detail by way of example and with reference to the accompanying drawings.

Showing:

Fig. 1 schematically in longitudinal section a

Inventive device for longitudinal and

Cross cutting of paper webs,

Fig. 2 shows the system of Figure 1 schematically in

Top view,

3 a in section and schematically the buffer area of the installation from FIG. 1,

3b in perspective, the buffer area of the system of FIG. 1st

Fig. 4 in perspective, the braking device

then to the buffer area, and

FIG. 5 shows schematically in section and in section the region of the transverse separation of the installation from FIG. 1.

Figure 1 shows a longitudinal section schematically a plant for cutting paper webs both in the longitudinal and in the transverse direction. The paper web 3 is almost

continuous speed one or two lanes from a stack or withdrawn from a roll in the cutting unit 1. The enema can be done with a manual

Cross section knife to facilitate feeding.

The reading zone 7 is arranged directly after the inlet and is designed to be short for reading, preferably from above and from below over the entire width of the form. For a few rare exceptions, however, it is possible to start / stop at reduced power in the

Provide reading zone.

The paper web is by means of the reading zone. 7

followed by central drive 9 pulled through the inlet and the reading zone. The drive is regulated in such a way that the most uniform possible web run is achieved

Dependence of control information, preferably from the reading (or number of sheets in applications without reading), drive with the subsequent knife, application specifications such as form height, speed, acceleration ramps, loop length, etc.

The web is then pushed through the central cutting blade and the webs separated in the middle are fed further to the buffer zone 15, like the vacuum box 12 shown schematically in FIG. 1. Whether these are provided by suction, for example works with a suction fan in the bottom 17 from below or with

Blowing in air from above is to be optimized in each case on the basis of the given conditions. An important point of the present invention is the novel arrangement of the separate loop produced by the central cut for the coupling of the continuous operation in the paper feed with the discontinuous operation in the subsequent

Quertrennung and simultaneous solution of the problem of merging the two sub-webs in 2-up operation with

different feed of the partial webs.

Instead of a single vacuum container 12, it is of course also possible to provide two juxtaposed containers, which in

Plant longitudinal direction can also be arranged offset to one another.

In contrast to the prior art, the buffer region 15 is arranged below the central section, that is, in the vacuum box 12, the two webs are already separated and the two loops 3 'and 3' 'side by side

arranged, resulting in a double function in the vacuum box:

- Compensation start / stop operation at the following cross-separation for almost continuous operation at the input

Compensation of a different feed of the

two separate partial webs due to different feed only one or the other web in non-common section.

Thus, the two loops of the two partial webs may have a different length. Both partial loops are at the inlet and outlet in the same plane.

In FIG. 3 a, the buffer area 15 is shown in detail, schematically and in section. FIG. 3b shows the buffer area 15 in perspective. Here, alternatively, by means of a blower 24 by blowing in the air from above, analogous results can be achieved as by suction from below, for example by means of suction fan through corresponding openings 18th

The vacuum box 12 can be a vertical one in the middle

Have separating plate 22 to attach the two

Avoid loops in the middle. Whether this actually leads to two separate vacuum trays, or this separating plate only in the upper area, for example in two parts with

Angle parts 22 ', is present, depending on

Requirements and operation are varied.

Subsequent to the buffer area 15, the two paper webs 3 'and 3' 'are guided over a so-called controlled braking area 21 as shown in perspective in FIG. By means of this a so-called

Overshoot the paper webs are prevented when they are stopped in the subsequently arranged cross-cutting each for a short moment. That's the way it is

For example, it is possible to provide suction holes 26 in the abutment surface formed by the paper webs 3 'and 3 ", as shown schematically in FIG. So if the two paper webs 3 'and 3' 'or only one of them by the following a so-called

Mergereinheit 23 arranged transport devices 24th respectively. 25 stopped in order to accomplish a transverse separation of one or both paper webs, takes place

simultaneously a deceleration of the respective paper web by generating a negative pressure. The big advantage of the braking proposed according to the invention is

on the one hand that the paper web is not bulged when braking, and no normally used

Brake elements such as brushes, rollers and the like can lead to Tonerverschmierung the printed paper webs. Also, the braking effect can be fast in the

Paper acceleration can be reversed to prevent tearing while maximizing the paper delay

Braking effect occurs.

As already mentioned, subsequently to the braking region 21, a so-called merger unit 23 is provided, in which the two paper webs 3 'and 3' ', for example by means of inclined sliding tubes on different

Layers are superimposed. The like

Merging or merging of parallel run

Paper webs are well known in the art. In order to avoid smearing, these sliding tubes of the merging unit 23 are equipped, for example, with blown air. From the inclined tubes exit the partial webs at different levels, as clearly visible in Figure 1. This different height is needed to make room for the two subsequent drives 24 and 25. The merger unit is adjustable for one-way, logical and illogical. In the single-track case, the tube axes run transversely to the belt direction. The two partial webs 3 'and 3''converge from their two planes on the shortest possible transport path to

Cross cutting unit. The two drives 24 and 25 run in start-stop mode. The subsequent transverse separation can be effected for example by means of a conventional cutting element, the invention proposes the

Use of a cutting element comprising two

Cutting edges, so in both the downward movement as well as upward movement of the cutting element

Cutting process can be performed. Reference is made to the international application WO 2004/018167, in which such an advantageous cutting element is described in detail. The content of this patent application is hereby part of the present invention and is used in combination with the inventive measures

Solution of the problem also claimed according to the invention.

A further measure according to the invention will be explained in more detail with reference to FIG. 5, in which the area of the transverse separation is shown here in detail and in detail. When feeding either the paper web 3 'or 3 "or at the same time both paper webs, this is done by means of the drives 24 and 25 which guide the respective paper web in the region of the transverse separating unit 27. At the

Forward transport of the paper webs is arranged downstream of the transverse separation transport device 29 is deactivated insofar as, for example, a guide roller or guide roller 41 of the drive roller or drive roller 43 is disposed in position 1, so that the

Paper web without resistance through the resulting gap can be pushed. Only shortly before or during the cutting process or at or shortly after the end of the cutting process by means of, for example, a cutting knife 27, the guide roller or roller 41 against the

Drive roller or roller 43 driven in position 2, whereby the now cut paper 31 is transported away. However, the mode of operation of the transport device 29 may also be such that the uncut web is transported through the take-off rollers after the cut sheet 31 has been removed. Then the take-off roller is lifted as described above, so that at least just before cutting the train can stretch without resistance. The trigger or guide roller 41 is delivered only during the cut, that is driven against the drive roller 43. But it is also possible to do so already very shortly before the cut to fix the cut sheet. In other words, there is a synchronous

Operating on the one hand the transport means 24 and 25 and on the other hand the transport means 29 comprising the two rollers or rollers 41 and 43.

The big advantage of this type of deduction compared to the deduction devices used today is that a simpler synchronization of feed and deduction is possible, the paper webs do not have to be driven by a so-called slip between the two rollers or rollers, the cutting accuracy can be increased simultaneously multiple paper webs can be synchronized on a cutting mark and the system through the

Use of multiple feeds and only one deduction is not overdetermined. The system described with reference to FIGS. 1 to 4 concentrates on the so-called 2-up operation. This corresponds to today's standard. The invention

described plant takes into account by the

so-called 2-up operation arising problem, since the merging of two parallel paths is required. In contrast, for example, the 1-up processing is only a trivial special case by a single-track operation is easily possible by removing the central cutting blade and straightening the sliding tubes in the merger.

Of course, the system described with reference to Figures 1 to 4 is also suitable for the two-channel operation provided that a two-channel input

is provided. Accordingly, a second drive is required in the entrance area, for example by the existing central drive laterally offset and a second drive is arranged. Of course, 3.4 or more tracks can be performed in parallel next to each other, be it by already feeding several tracks or by one or two tracks are cut several times.

The system illustrated in FIGS. 1 to 4 serves primarily to explain the present invention.

Of course, the system can be configured differently or supplemented by other elements. It is also possible to modify the selected parts of the system.

With regard to the present invention, it is proposed, on the one hand, to design the buffer designed according to the invention between continuous and discontinuous operation to compensate for the most extensive

continuous propulsion with the discontinuous operation. In addition, the controlled braking following the buffer area to achieve a controlled braking of the paper webs and finally the controlled trigger or the synchronization of feed and deduction in the area of the transverse separation.

Claims

claims

1. Apparatus for cutting paper webs with

a largely continuously operated area of the paper feeder, a

discontinuous region of the transverse separation of the paper web and a buffer region (15) for coupling the continuous and

Discontinuous area, wherein mind. An upwardly open box-like container (17) is provided, in which the paper web or webs (3, 3 ', 21) is guided freely suspended hanging or are, characterized in that the

Buffer region is arranged after a longitudinal cutting device (9), for generating at least two longitudinal webs (3,3 ') which in the container at least two separately adjacent paths are guided or that mind. Two containers next to each other or offset side by side

are arranged in which the paper webs are guided.

2. Apparatus according to claim 1, characterized

in that a vacuum can be generated in the container, in such a way as to drive or pull the paper webs into the container and optionally against the side walls.

3. Device according to one of claims 1 or 2,

characterized in that a blower provided is to the paper webs m the container too

float .

Device according to one of claims 1 to 3, characterized in that in the container from above in the middle of the loop of the web or webs a separating device (22) as a divider

is introduced to prevent attachment of the loops in the middle.

Device according to one of claims 1 to 4, characterized in that suction elements (18) are provided in the side walls (12).

Device according to one of claims 1 to 5, characterized in that subsequently to the buffer area a controlled braking area (22) is provided, such that a deceleration of the movement of the paper web or the paper webs is made possible.

Apparatus according to claim 6, characterized

characterized in that in the controlled braking region (22) means for generating a negative pressure in the region below the paper webs are provided, such that a braking of the movement of the

Paper web or the paper webs is enabled or by canceling the negative pressure

Re-accelerating the paper web (s).

Device according to one of claims 7 or 8, characterized in that in by the

Paper webs swept surface of the

Cutting device or plant openings are provided, in which for example by means of a blower, a negative pressure can be generated.

Device for cutting paper webs

Preferably according to one of claims 1 to 8, characterized in that in the region of

Cross separation at least one, the

Cross-cutting device (27) upstream

Transport device (24,25) connected to another of the cross-cutting device (27) downstream

Transport device (29) is coupled or synchronized, such that the further

Transport device is at least temporarily disabled when feeding by the upstream transport device and only shortly before, is activated at or immediately after the cross separation is to lead away the cut paper from the transverse separation.

Apparatus according to claim 9, characterized

characterized in that the further

Transport device of at least two

Transport rollers or rollers (41,43), wherein the one roller or roller (41) is positioned at deactivation from the other roller or roller (43) to pass a

Paper web at least temporarily allow resistance.

Device according to one of claims 1 to 10, characterized in that the transverse separation takes place by means of at least one cutting element, which has at least two cutting edges, such that with each movement of the

Cutting element such as at

Pendulum movements such as upward or downward, a transverse separation of the paper web takes place.

A method for cutting paper webs, wherein the paper web is supplied and advanced at least substantially continuously to be introduced discontinuously into a cross-cutting device, characterized in that the continuously advanced paper webs are slit after a longitudinal separation by at least one open-topped box-like container (17) to the subsequent discontinuous processing in the cross-cutting device by

To increase or decrease the size of the loop (-n) compensate, the webs are driven by means of negative pressure in the container from below and / or bubbles from above into the container.

A method according to claim 12, characterized in that the emerging from the container

Paper webs as a result of processing in the subsequent discontinuous region of

Quertrenneinrichtung be slowed down by means of negative pressure and by canceling the negative pressure, the braking effect is canceled to allow accelerating and further transporting the paper webs. Method for cutting paper webs

preferably according to one of claims 12 or 13, wherein the paper web is supplied and advanced at least substantially continuously, and then discontinuously into a

Cross-cutting device to be introduced, characterized in that when feeding the paper webs to the cross-cutting device provided below the cross-cutting device

Transport device is deactivated in such a way that the feeding of the paper webs largely

can be done without resistance.